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Plant details

Helianthus are known as sunflowers due to the way the flower heads follow the light from the sun. They come in a wide range of forms, from the popular and common giant, to a multitude of smaller varieties, most of which are yellow and include double-flowered forms. Helianthus annuus is the larger species, with broad and bristly, heart-shaped leaves, producing flower heads that grow up to 30cm wide. All Helianthus should be planted in a sunny position, with moist but well-drained soil. Helianthus annuus 'Russian Giant' produces large, bright yellow flowers and is useful for hiding unsightly fences or walls, as it's particularly tall.

Family: Asteraceae

Genus: Helianthus

Species: annuus

Cultivar: Russian Giant

Plant type: Hardy annual

Flower colour: Yellow

Foliage colour: Mid-green

Feature: Flowers

Sun exposure: Full sun

Soil: Well-drained/light, Clay/heavy

Hardiness: Hardy

Skill level: Beginner

Height: 250cm

Spread: 30cm

Time to plant seeds: March to May

Flowering period: July to September

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